hw/mc146818rtc.c

   1 /*
   2  * QEMU MC146818 RTC emulation
   3  *
   4  * Copyright (c) 2003-2004 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw.h"
  25 #include "qemu-timer.h"
  26 #include "sysemu.h"
  27 #include "pc.h"
  28 #include "apic.h"
  29 #include "isa.h"
  30 #include "mc146818rtc.h"
  31
  32 //#define DEBUG_CMOS
  33 //#define DEBUG_COALESCED
  34
  35 #ifdef DEBUG_CMOS
  36 # define CMOS_DPRINTF(format, ...)      printf(format, ## __VA_ARGS__)
  37 #else
  38 # define CMOS_DPRINTF(format, ...)      do { } while (0)
  39 #endif
  40
  41 #ifdef DEBUG_COALESCED
  42 # define DPRINTF_C(format, ...)      printf(format, ## __VA_ARGS__)
  43 #else
  44 # define DPRINTF_C(format, ...)      do { } while (0)
  45 #endif
  46
  47 #define RTC_REINJECT_ON_ACK_COUNT 20
  48
  49 #define RTC_SECONDS             0
  50 #define RTC_SECONDS_ALARM       1
  51 #define RTC_MINUTES             2
  52 #define RTC_MINUTES_ALARM       3
  53 #define RTC_HOURS               4
  54 #define RTC_HOURS_ALARM         5
  55 #define RTC_ALARM_DONT_CARE    0xC0
  56
  57 #define RTC_DAY_OF_WEEK         6
  58 #define RTC_DAY_OF_MONTH        7
  59 #define RTC_MONTH               8
  60 #define RTC_YEAR                9
  61
  62 #define RTC_REG_A               10
  63 #define RTC_REG_B               11
  64 #define RTC_REG_C               12
  65 #define RTC_REG_D               13
  66
  67 #define REG_A_UIP 0x80
  68
  69 #define REG_B_SET  0x80
  70 #define REG_B_PIE  0x40
  71 #define REG_B_AIE  0x20
  72 #define REG_B_UIE  0x10
  73 #define REG_B_SQWE 0x08
  74 #define REG_B_DM   0x04
  75 #define REG_B_24H  0x02
  76
  77 #define REG_C_UF   0x10
  78 #define REG_C_IRQF 0x80
  79 #define REG_C_PF   0x40
  80 #define REG_C_AF   0x20
  81
  82 typedef struct RTCState {
  83     ISADevice dev;
  84     MemoryRegion io;
  85     uint8_t cmos_data[128];
  86     uint8_t cmos_index;
  87     struct tm current_tm;
  88     int32_t base_year;
  89     qemu_irq irq;
  90     qemu_irq sqw_irq;
  91     int it_shift;
  92     /* periodic timer */
  93     QEMUTimer *periodic_timer;
  94     int64_t next_periodic_time;
  95     /* second update */
  96     int64_t next_second_time;
  97     uint16_t irq_reinject_on_ack_count;
  98     uint32_t irq_coalesced;
  99     uint32_t period;
 100     QEMUTimer *coalesced_timer;
 101     QEMUTimer *second_timer;
 102     QEMUTimer *second_timer2;
 103     Notifier clock_reset_notifier;
 104     LostTickPolicy lost_tick_policy;
 105 } RTCState;
 106
 107 static void rtc_set_time(RTCState *s);
 108 static void rtc_copy_date(RTCState *s);
 109
 110 #ifdef TARGET_I386
 111 static void rtc_coalesced_timer_update(RTCState *s)
 112 {
 113     if (s->irq_coalesced == 0) {
 114         qemu_del_timer(s->coalesced_timer);
 115     } else {
 116         /* divide each RTC interval to 2 - 8 smaller intervals */
 117         int c = MIN(s->irq_coalesced, 7) + 1;
 118         int64_t next_clock = qemu_get_clock_ns(rtc_clock) +
 119             muldiv64(s->period / c, get_ticks_per_sec(), 32768);
 120         qemu_mod_timer(s->coalesced_timer, next_clock);
 121     }
 122 }
 123
 124 static void rtc_coalesced_timer(void *opaque)
 125 {
 126     RTCState *s = opaque;
 127
 128     if (s->irq_coalesced != 0) {
 129         apic_reset_irq_delivered();
 130         s->cmos_data[RTC_REG_C] |= 0xc0;
 131         DPRINTF_C("cmos: injecting from timer\n");
 132         qemu_irq_raise(s->irq);
 133         if (apic_get_irq_delivered()) {
 134             s->irq_coalesced--;
 135             DPRINTF_C("cmos: coalesced irqs decreased to %d\n",
 136                       s->irq_coalesced);
 137         }
 138     }
 139
 140     rtc_coalesced_timer_update(s);
 141 }
 142 #endif
 143
 144 static void rtc_timer_update(RTCState *s, int64_t current_time)
 145 {
 146     int period_code, period;
 147     int64_t cur_clock, next_irq_clock;
 148
 149     period_code = s->cmos_data[RTC_REG_A] & 0x0f;
 150     if (period_code != 0
 151         && ((s->cmos_data[RTC_REG_B] & REG_B_PIE)
 152             || ((s->cmos_data[RTC_REG_B] & REG_B_SQWE) && s->sqw_irq))) {
 153         if (period_code <= 2)
 154             period_code += 7;
 155         /* period in 32 Khz cycles */
 156         period = 1 << (period_code - 1);
 157 #ifdef TARGET_I386
 158         if (period != s->period) {
 159             s->irq_coalesced = (s->irq_coalesced * s->period) / period;
 160             DPRINTF_C("cmos: coalesced irqs scaled to %d\n", s->irq_coalesced);
 161         }
 162         s->period = period;
 163 #endif
 164         /* compute 32 khz clock */
 165         cur_clock = muldiv64(current_time, 32768, get_ticks_per_sec());
 166         next_irq_clock = (cur_clock & ~(period - 1)) + period;
 167         s->next_periodic_time =
 168             muldiv64(next_irq_clock, get_ticks_per_sec(), 32768) + 1;
 169         qemu_mod_timer(s->periodic_timer, s->next_periodic_time);
 170     } else {
 171 #ifdef TARGET_I386
 172         s->irq_coalesced = 0;
 173 #endif
 174         qemu_del_timer(s->periodic_timer);
 175     }
 176 }
 177
 178 static void rtc_periodic_timer(void *opaque)
 179 {
 180     RTCState *s = opaque;
 181
 182     rtc_timer_update(s, s->next_periodic_time);
 183     s->cmos_data[RTC_REG_C] |= REG_C_PF;
 184     if (s->cmos_data[RTC_REG_B] & REG_B_PIE) {
 185         s->cmos_data[RTC_REG_C] |= REG_C_IRQF;
 186 #ifdef TARGET_I386
 187         if (s->lost_tick_policy == LOST_TICK_SLEW) {
 188             if (s->irq_reinject_on_ack_count >= RTC_REINJECT_ON_ACK_COUNT)
 189                 s->irq_reinject_on_ack_count = 0;
 190             apic_reset_irq_delivered();
 191             qemu_irq_raise(s->irq);
 192             if (!apic_get_irq_delivered()) {
 193                 s->irq_coalesced++;
 194                 rtc_coalesced_timer_update(s);
 195                 DPRINTF_C("cmos: coalesced irqs increased to %d\n",
 196                           s->irq_coalesced);
 197             }
 198         } else
 199 #endif
 200         qemu_irq_raise(s->irq);
 201     }
 202     if (s->cmos_data[RTC_REG_B] & REG_B_SQWE) {
 203         /* Not square wave at all but we don't want 2048Hz interrupts!
 204            Must be seen as a pulse.  */
 205         qemu_irq_raise(s->sqw_irq);
 206     }
 207 }
 208
 209 static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data)
 210 {
 211     RTCState *s = opaque;
 212
 213     if ((addr & 1) == 0) {
 214         s->cmos_index = data & 0x7f;
 215     } else {
 216         CMOS_DPRINTF("cmos: write index=0x%02x val=0x%02x\n",
 217                      s->cmos_index, data);
 218         switch(s->cmos_index) {
 219         case RTC_SECONDS_ALARM:
 220         case RTC_MINUTES_ALARM:
 221         case RTC_HOURS_ALARM:
 222             s->cmos_data[s->cmos_index] = data;
 223             break;
 224         case RTC_SECONDS:
 225         case RTC_MINUTES:
 226         case RTC_HOURS:
 227         case RTC_DAY_OF_WEEK:
 228         case RTC_DAY_OF_MONTH:
 229         case RTC_MONTH:
 230         case RTC_YEAR:
 231             s->cmos_data[s->cmos_index] = data;
 232             /* if in set mode, do not update the time */
 233             if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
 234                 rtc_set_time(s);
 235             }
 236             break;
 237         case RTC_REG_A:
 238             /* UIP bit is read only */
 239             s->cmos_data[RTC_REG_A] = (data & ~REG_A_UIP) |
 240                 (s->cmos_data[RTC_REG_A] & REG_A_UIP);
 241             rtc_timer_update(s, qemu_get_clock_ns(rtc_clock));
 242             break;
 243         case RTC_REG_B:
 244             if (data & REG_B_SET) {
 245                 /* set mode: reset UIP mode */
 246                 s->cmos_data[RTC_REG_A] &= ~REG_A_UIP;
 247                 data &= ~REG_B_UIE;
 248             } else {
 249                 /* if disabling set mode, update the time */
 250                 if (s->cmos_data[RTC_REG_B] & REG_B_SET) {
 251                     rtc_set_time(s);
 252                 }
 253             }
 254             if (((s->cmos_data[RTC_REG_B] ^ data) & (REG_B_DM | REG_B_24H)) &&
 255                 !(data & REG_B_SET)) {
 256                 /* If the time format has changed and not in set mode,
 257                    update the registers immediately. */
 258                 s->cmos_data[RTC_REG_B] = data;
 259                 rtc_copy_date(s);
 260             } else {
 261                 s->cmos_data[RTC_REG_B] = data;
 262             }
 263             rtc_timer_update(s, qemu_get_clock_ns(rtc_clock));
 264             break;
 265         case RTC_REG_C:
 266         case RTC_REG_D:
 267             /* cannot write to them */
 268             break;
 269         default:
 270             s->cmos_data[s->cmos_index] = data;
 271             break;
 272         }
 273     }
 274 }
 275
 276 static inline int rtc_to_bcd(RTCState *s, int a)
 277 {
 278     if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
 279         return a;
 280     } else {
 281         return ((a / 10) << 4) | (a % 10);
 282     }
 283 }
 284
 285 static inline int rtc_from_bcd(RTCState *s, int a)
 286 {
 287     if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
 288         return a;
 289     } else {
 290         return ((a >> 4) * 10) + (a & 0x0f);
 291     }
 292 }
 293
 294 static void rtc_set_time(RTCState *s)
 295 {
 296     struct tm *tm = &s->current_tm;
 297
 298     tm->tm_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS]);
 299     tm->tm_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES]);
 300     tm->tm_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
 301     if (!(s->cmos_data[RTC_REG_B] & REG_B_24H)) {
 302         tm->tm_hour %= 12;
 303         if (s->cmos_data[RTC_HOURS] & 0x80) {
 304             tm->tm_hour += 12;
 305         }
 306     }
 307     tm->tm_wday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]) - 1;
 308     tm->tm_mday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]);
 309     tm->tm_mon = rtc_from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
 310     tm->tm_year = rtc_from_bcd(s, s->cmos_data[RTC_YEAR]) + s->base_year - 1900;
 311
 312     rtc_change_mon_event(tm);
 313 }
 314
 315 static void rtc_copy_date(RTCState *s)
 316 {
 317     const struct tm *tm = &s->current_tm;
 318     int year;
 319
 320     s->cmos_data[RTC_SECONDS] = rtc_to_bcd(s, tm->tm_sec);
 321     s->cmos_data[RTC_MINUTES] = rtc_to_bcd(s, tm->tm_min);
 322     if (s->cmos_data[RTC_REG_B] & REG_B_24H) {
 323         /* 24 hour format */
 324         s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, tm->tm_hour);
 325     } else {
 326         /* 12 hour format */
 327         int h = (tm->tm_hour % 12) ? tm->tm_hour % 12 : 12;
 328         s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, h);
 329         if (tm->tm_hour >= 12)
 330             s->cmos_data[RTC_HOURS] |= 0x80;
 331     }
 332     s->cmos_data[RTC_DAY_OF_WEEK] = rtc_to_bcd(s, tm->tm_wday + 1);
 333     s->cmos_data[RTC_DAY_OF_MONTH] = rtc_to_bcd(s, tm->tm_mday);
 334     s->cmos_data[RTC_MONTH] = rtc_to_bcd(s, tm->tm_mon + 1);
 335     year = (tm->tm_year - s->base_year) % 100;
 336     if (year < 0)
 337         year += 100;
 338     s->cmos_data[RTC_YEAR] = rtc_to_bcd(s, year);
 339 }
 340
 341 /* month is between 0 and 11. */
 342 static int get_days_in_month(int month, int year)
 343 {
 344     static const int days_tab[12] = {
 345         31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
 346     };
 347     int d;
 348     if ((unsigned )month >= 12)
 349         return 31;
 350     d = days_tab[month];
 351     if (month == 1) {
 352         if ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0))
 353             d++;
 354     }
 355     return d;
 356 }
 357
 358 /* update 'tm' to the next second */
 359 static void rtc_next_second(struct tm *tm)
 360 {
 361     int days_in_month;
 362
 363     tm->tm_sec++;
 364     if ((unsigned)tm->tm_sec >= 60) {
 365         tm->tm_sec = 0;
 366         tm->tm_min++;
 367         if ((unsigned)tm->tm_min >= 60) {
 368             tm->tm_min = 0;
 369             tm->tm_hour++;
 370             if ((unsigned)tm->tm_hour >= 24) {
 371                 tm->tm_hour = 0;
 372                 /* next day */
 373                 tm->tm_wday++;
 374                 if ((unsigned)tm->tm_wday >= 7)
 375                     tm->tm_wday = 0;
 376                 days_in_month = get_days_in_month(tm->tm_mon,
 377                                                   tm->tm_year + 1900);
 378                 tm->tm_mday++;
 379                 if (tm->tm_mday < 1) {
 380                     tm->tm_mday = 1;
 381                 } else if (tm->tm_mday > days_in_month) {
 382                     tm->tm_mday = 1;
 383                     tm->tm_mon++;
 384                     if (tm->tm_mon >= 12) {
 385                         tm->tm_mon = 0;
 386                         tm->tm_year++;
 387                     }
 388                 }
 389             }
 390         }
 391     }
 392 }
 393
 394
 395 static void rtc_update_second(void *opaque)
 396 {
 397     RTCState *s = opaque;
 398     int64_t delay;
 399
 400     /* if the oscillator is not in normal operation, we do not update */
 401     if ((s->cmos_data[RTC_REG_A] & 0x70) != 0x20) {
 402         s->next_second_time += get_ticks_per_sec();
 403         qemu_mod_timer(s->second_timer, s->next_second_time);
 404     } else {
 405         rtc_next_second(&s->current_tm);
 406
 407         if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
 408             /* update in progress bit */
 409             s->cmos_data[RTC_REG_A] |= REG_A_UIP;
 410         }
 411         /* should be 244 us = 8 / 32768 seconds, but currently the
 412            timers do not have the necessary resolution. */
 413         delay = (get_ticks_per_sec() * 1) / 100;
 414         if (delay < 1)
 415             delay = 1;
 416         qemu_mod_timer(s->second_timer2,
 417                        s->next_second_time + delay);
 418     }
 419 }
 420
 421 static void rtc_update_second2(void *opaque)
 422 {
 423     RTCState *s = opaque;
 424
 425     if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
 426         rtc_copy_date(s);
 427     }
 428
 429     /* check alarm */
 430     if (((s->cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0 ||
 431          rtc_from_bcd(s, s->cmos_data[RTC_SECONDS_ALARM]) == s->current_tm.tm_sec) &&
 432         ((s->cmos_data[RTC_MINUTES_ALARM] & 0xc0) == 0xc0 ||
 433          rtc_from_bcd(s, s->cmos_data[RTC_MINUTES_ALARM]) == s->current_tm.tm_min) &&
 434         ((s->cmos_data[RTC_HOURS_ALARM] & 0xc0) == 0xc0 ||
 435          rtc_from_bcd(s, s->cmos_data[RTC_HOURS_ALARM]) == s->current_tm.tm_hour)) {
 436
 437         s->cmos_data[RTC_REG_C] |= REG_C_AF;
 438         if (s->cmos_data[RTC_REG_B] & REG_B_AIE) {
 439             qemu_irq_raise(s->irq);
 440             s->cmos_data[RTC_REG_C] |= REG_C_IRQF;
 441         }
 442     }
 443
 444     /* update ended interrupt */
 445     s->cmos_data[RTC_REG_C] |= REG_C_UF;
 446     if (s->cmos_data[RTC_REG_B] & REG_B_UIE) {
 447         s->cmos_data[RTC_REG_C] |= REG_C_IRQF;
 448         qemu_irq_raise(s->irq);
 449     }
 450
 451     /* clear update in progress bit */
 452     s->cmos_data[RTC_REG_A] &= ~REG_A_UIP;
 453
 454     s->next_second_time += get_ticks_per_sec();
 455     qemu_mod_timer(s->second_timer, s->next_second_time);
 456 }
 457
 458 static uint32_t cmos_ioport_read(void *opaque, uint32_t addr)
 459 {
 460     RTCState *s = opaque;
 461     int ret;
 462     if ((addr & 1) == 0) {
 463         return 0xff;
 464     } else {
 465         switch(s->cmos_index) {
 466         case RTC_SECONDS:
 467         case RTC_MINUTES:
 468         case RTC_HOURS:
 469         case RTC_DAY_OF_WEEK:
 470         case RTC_DAY_OF_MONTH:
 471         case RTC_MONTH:
 472         case RTC_YEAR:
 473             ret = s->cmos_data[s->cmos_index];
 474             break;
 475         case RTC_REG_A:
 476             ret = s->cmos_data[s->cmos_index];
 477             break;
 478         case RTC_REG_C:
 479             ret = s->cmos_data[s->cmos_index];
 480             qemu_irq_lower(s->irq);
 481             s->cmos_data[RTC_REG_C] = 0x00;
 482 #ifdef TARGET_I386
 483             if(s->irq_coalesced &&
 484                     (s->cmos_data[RTC_REG_B] & REG_B_PIE) &&
 485                     s->irq_reinject_on_ack_count < RTC_REINJECT_ON_ACK_COUNT) {
 486                 s->irq_reinject_on_ack_count++;
 487                 s->cmos_data[RTC_REG_C] |= REG_C_IRQF | REG_C_PF;
 488                 apic_reset_irq_delivered();
 489                 DPRINTF_C("cmos: injecting on ack\n");
 490                 qemu_irq_raise(s->irq);
 491                 if (apic_get_irq_delivered()) {
 492                     s->irq_coalesced--;
 493                     DPRINTF_C("cmos: coalesced irqs decreased to %d\n",
 494                               s->irq_coalesced);
 495                 }
 496             }
 497 #endif
 498             break;
 499         default:
 500             ret = s->cmos_data[s->cmos_index];
 501             break;
 502         }
 503         CMOS_DPRINTF("cmos: read index=0x%02x val=0x%02x\n",
 504                      s->cmos_index, ret);
 505         return ret;
 506     }
 507 }
 508
 509 void rtc_set_memory(ISADevice *dev, int addr, int val)
 510 {
 511     RTCState *s = DO_UPCAST(RTCState, dev, dev);
 512     if (addr >= 0 && addr <= 127)
 513         s->cmos_data[addr] = val;
 514 }
 515
 516 void rtc_set_date(ISADevice *dev, const struct tm *tm)
 517 {
 518     RTCState *s = DO_UPCAST(RTCState, dev, dev);
 519     s->current_tm = *tm;
 520     rtc_copy_date(s);
 521 }
 522
 523 /* PC cmos mappings */
 524 #define REG_IBM_CENTURY_BYTE        0x32
 525 #define REG_IBM_PS2_CENTURY_BYTE    0x37
 526
 527 static void rtc_set_date_from_host(ISADevice *dev)
 528 {
 529     RTCState *s = DO_UPCAST(RTCState, dev, dev);
 530     struct tm tm;
 531     int val;
 532
 533     /* set the CMOS date */
 534     qemu_get_timedate(&tm, 0);
 535     rtc_set_date(dev, &tm);
 536
 537     val = rtc_to_bcd(s, (tm.tm_year / 100) + 19);
 538     rtc_set_memory(dev, REG_IBM_CENTURY_BYTE, val);
 539     rtc_set_memory(dev, REG_IBM_PS2_CENTURY_BYTE, val);
 540 }
 541
 542 static int rtc_post_load(void *opaque, int version_id)
 543 {
 544 #ifdef TARGET_I386
 545     RTCState *s = opaque;
 546
 547     if (version_id >= 2) {
 548         if (s->lost_tick_policy == LOST_TICK_SLEW) {
 549             rtc_coalesced_timer_update(s);
 550         }
 551     }
 552 #endif
 553     return 0;
 554 }
 555
 556 static const VMStateDescription vmstate_rtc = {
 557     .name = "mc146818rtc",
 558     .version_id = 2,
 559     .minimum_version_id = 1,
 560     .minimum_version_id_old = 1,
 561     .post_load = rtc_post_load,
 562     .fields      = (VMStateField []) {
 563         VMSTATE_BUFFER(cmos_data, RTCState),
 564         VMSTATE_UINT8(cmos_index, RTCState),
 565         VMSTATE_INT32(current_tm.tm_sec, RTCState),
 566         VMSTATE_INT32(current_tm.tm_min, RTCState),
 567         VMSTATE_INT32(current_tm.tm_hour, RTCState),
 568         VMSTATE_INT32(current_tm.tm_wday, RTCState),
 569         VMSTATE_INT32(current_tm.tm_mday, RTCState),
 570         VMSTATE_INT32(current_tm.tm_mon, RTCState),
 571         VMSTATE_INT32(current_tm.tm_year, RTCState),
 572         VMSTATE_TIMER(periodic_timer, RTCState),
 573         VMSTATE_INT64(next_periodic_time, RTCState),
 574         VMSTATE_INT64(next_second_time, RTCState),
 575         VMSTATE_TIMER(second_timer, RTCState),
 576         VMSTATE_TIMER(second_timer2, RTCState),
 577         VMSTATE_UINT32_V(irq_coalesced, RTCState, 2),
 578         VMSTATE_UINT32_V(period, RTCState, 2),
 579         VMSTATE_END_OF_LIST()
 580     }
 581 };
 582
 583 static void rtc_notify_clock_reset(Notifier *notifier, void *data)
 584 {
 585     RTCState *s = container_of(notifier, RTCState, clock_reset_notifier);
 586     int64_t now = *(int64_t *)data;
 587
 588     rtc_set_date_from_host(&s->dev);
 589     s->next_second_time = now + (get_ticks_per_sec() * 99) / 100;
 590     qemu_mod_timer(s->second_timer2, s->next_second_time);
 591     rtc_timer_update(s, now);
 592 #ifdef TARGET_I386
 593     if (s->lost_tick_policy == LOST_TICK_SLEW) {
 594         rtc_coalesced_timer_update(s);
 595     }
 596 #endif
 597 }
 598
 599 static void rtc_reset(void *opaque)
 600 {
 601     RTCState *s = opaque;
 602
 603     s->cmos_data[RTC_REG_B] &= ~(REG_B_PIE | REG_B_AIE | REG_B_SQWE);
 604     s->cmos_data[RTC_REG_C] &= ~(REG_C_UF | REG_C_IRQF | REG_C_PF | REG_C_AF);
 605
 606     qemu_irq_lower(s->irq);
 607
 608 #ifdef TARGET_I386
 609     if (s->lost_tick_policy == LOST_TICK_SLEW) {
 610         s->irq_coalesced = 0;
 611     }
 612 #endif
 613 }
 614
 615 static const MemoryRegionPortio cmos_portio[] = {
 616     {0, 2, 1, .read = cmos_ioport_read, .write = cmos_ioport_write },
 617     PORTIO_END_OF_LIST(),
 618 };
 619
 620 static const MemoryRegionOps cmos_ops = {
 621     .old_portio = cmos_portio
 622 };
 623
 624 // FIXME add int32 visitor
 625 static void visit_type_int32(Visitor *v, int *value, const char *name, Error **errp)
 626 {
 627     int64_t val = *value;
 628     visit_type_int(v, &val, name, errp);
 629 }
 630
 631 static void rtc_get_date(Object *obj, Visitor *v, void *opaque,
 632                          const char *name, Error **errp)
 633 {
 634     ISADevice *isa = ISA_DEVICE(obj);
 635     RTCState *s = DO_UPCAST(RTCState, dev, isa);
 636
 637     visit_start_struct(v, NULL, "struct tm", name, 0, errp);
 638     visit_type_int32(v, &s->current_tm.tm_year, "tm_year", errp);
 639     visit_type_int32(v, &s->current_tm.tm_mon, "tm_mon", errp);
 640     visit_type_int32(v, &s->current_tm.tm_mday, "tm_mday", errp);
 641     visit_type_int32(v, &s->current_tm.tm_hour, "tm_hour", errp);
 642     visit_type_int32(v, &s->current_tm.tm_min, "tm_min", errp);
 643     visit_type_int32(v, &s->current_tm.tm_sec, "tm_sec", errp);
 644     visit_end_struct(v, errp);
 645 }
 646
 647 static int rtc_initfn(ISADevice *dev)
 648 {
 649     RTCState *s = DO_UPCAST(RTCState, dev, dev);
 650     int base = 0x70;
 651
 652     s->cmos_data[RTC_REG_A] = 0x26;
 653     s->cmos_data[RTC_REG_B] = 0x02;
 654     s->cmos_data[RTC_REG_C] = 0x00;
 655     s->cmos_data[RTC_REG_D] = 0x80;
 656
 657     rtc_set_date_from_host(dev);
 658
 659 #ifdef TARGET_I386
 660     switch (s->lost_tick_policy) {
 661     case LOST_TICK_SLEW:
 662         s->coalesced_timer =
 663             qemu_new_timer_ns(rtc_clock, rtc_coalesced_timer, s);
 664         break;
 665     case LOST_TICK_DISCARD:
 666         break;
 667     default:
 668         return -EINVAL;
 669     }
 670 #endif
 671
 672     s->periodic_timer = qemu_new_timer_ns(rtc_clock, rtc_periodic_timer, s);
 673     s->second_timer = qemu_new_timer_ns(rtc_clock, rtc_update_second, s);
 674     s->second_timer2 = qemu_new_timer_ns(rtc_clock, rtc_update_second2, s);
 675
 676     s->clock_reset_notifier.notify = rtc_notify_clock_reset;
 677     qemu_register_clock_reset_notifier(rtc_clock, &s->clock_reset_notifier);
 678
 679     s->next_second_time =
 680         qemu_get_clock_ns(rtc_clock) + (get_ticks_per_sec() * 99) / 100;
 681     qemu_mod_timer(s->second_timer2, s->next_second_time);
 682
 683     memory_region_init_io(&s->io, &cmos_ops, s, "rtc", 2);
 684     isa_register_ioport(dev, &s->io, base);
 685
 686     qdev_set_legacy_instance_id(&dev->qdev, base, 2);
 687     qemu_register_reset(rtc_reset, s);
 688
 689     object_property_add(OBJECT(s), "date", "struct tm",
 690                         rtc_get_date, NULL, NULL, s, NULL);
 691
 692     return 0;
 693 }
 694
 695 ISADevice *rtc_init(ISABus *bus, int base_year, qemu_irq intercept_irq)
 696 {
 697     ISADevice *dev;
 698     RTCState *s;
 699
 700     dev = isa_create(bus, "mc146818rtc");
 701     s = DO_UPCAST(RTCState, dev, dev);
 702     qdev_prop_set_int32(&dev->qdev, "base_year", base_year);
 703     qdev_init_nofail(&dev->qdev);
 704     if (intercept_irq) {
 705         s->irq = intercept_irq;
 706     } else {
 707         isa_init_irq(dev, &s->irq, RTC_ISA_IRQ);
 708     }
 709     return dev;
 710 }
 711
 712 static Property mc146818rtc_properties[] = {
 713     DEFINE_PROP_INT32("base_year", RTCState, base_year, 1980),
 714     DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", RTCState,
 715                                lost_tick_policy, LOST_TICK_DISCARD),
 716     DEFINE_PROP_END_OF_LIST(),
 717 };
 718
 719 static void rtc_class_initfn(ObjectClass *klass, void *data)
 720 {
 721     DeviceClass *dc = DEVICE_CLASS(klass);
 722     ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
 723     ic->init = rtc_initfn;
 724     dc->no_user = 1;
 725     dc->vmsd = &vmstate_rtc;
 726     dc->props = mc146818rtc_properties;
 727 }
 728
 729 static TypeInfo mc146818rtc_info = {
 730     .name          = "mc146818rtc",
 731     .parent        = TYPE_ISA_DEVICE,
 732     .instance_size = sizeof(RTCState),
 733     .class_init    = rtc_class_initfn,
 734 };
 735
 736 static void mc146818rtc_register_types(void)
 737 {
 738     type_register_static(&mc146818rtc_info);
 739 }
 740
 741 type_init(mc146818rtc_register_types)